There’s more to 3.14 than a cool-looking symbol. This awesome wallet, made from recyclable, water-resistant, and sturdy Tyvek, features the first 2,940 digits of the never ending Pi on blue and white, tractor hole, printer paper. Slim, but full of compartments and pockets for your bills, cards, and metro tickets, this eco-friendly wallet by Mighty Wallets is full of endless possibilities! Slip it in your back pocket or in the zippered interior of your handbag, and you’ll have a magic number that keeps growing, even if your bank doesn’t.